CN101915917A

CN101915917A - Ultrasonic ranging device

Info

Publication number: CN101915917A
Application number: CN 201010266966
Authority: CN
Inventors: 何婧初; 贾君
Original assignee: Shanghai Jiaotong University
Current assignee: Shanghai Jiaotong University
Priority date: 2010-08-31
Filing date: 2010-08-31
Publication date: 2010-12-15
Anticipated expiration: 2030-08-31
Also published as: CN101915917B

Abstract

The invention discloses an ultrasonic ranging device which belongs to the field of ultrasonic ranging and comprises an ultrasonic emitting and receiving module and a controlling module, wherein the ultrasonic emitting and receiving module is connected with the controlling module, the controlling module transmits a ranging control signal to the ultrasonic emitting and receiving module, and the ultrasonic emitting and receiving module transmits an ultrasonic data signal to the controlling module. The invention lowers the all known blind area from 40cm to 20cm; at the same time, the invention has the advantages of simple structure and high ranging efficiency and is not influenced by the environment temperature and vibration.

Description

Supersonic range finder

Technical field

What the present invention relates to is the device in a kind of supersonic technique field, specifically is a kind of supersonic range finder.

Background technology

The ultrasonic ranging method is meant to utilize between ultrasonic measurement known reference position and the target object surface and realizes the method for contactless range observation apart from combining with electronic technology simultaneously.As a kind of typical non-cpntact measurement is the ultrasonic ranging method, this method has the advantage that extraneous factors such as not being subjected to light, electromagnetic wave and dust is disturbed, this method is come measuring distance based on calculating transmission time or other parameters of ultrasound wave between testee and ultrasonic probe, and is harmless to measured target.And ultrasonic propagation velocity is in quite on a large scale and frequency-independent.

In gas, ultrasonic propagation velocity is relevant with gaseous species, pressure and temperature.In air, hyperacoustic velocity of propagation is main relevant with the pressure and temperature of air, because the atmospheric pressure variation is very little, its velocity of propagation mainly is subjected to Temperature Influence under the normal condition.Aerial velocity of propagation:

c = 331.4 + \sqrt{1 + \frac{T}{263}} - - - (1)

In the formula, c is a ultrasonic velocity, and T is a temperature in the air.

Through existing document is studied, Chinese invention patent 200910036537.2 has been narrated a kind of supersonic range finder, and this installs according to object space, setting threshold, and by different driving signal frequencies, measure.Under this pattern, though the blind area decreases, increased anticipation to object space, do not meet practical engineering application, reduced the efficient of range finding.Simultaneously, in this patent, ultrasound wave is vulnerable to the influence of environment temperature, vibration in measuring process.

Summary of the invention

The present invention is directed to the prior art above shortcomings, a kind of supersonic range finder is provided, known blind area is reduced to 20 centimetres from 40 centimetres, simultaneously simple in structure, range finding efficient height is not subjected to the influence of environment temperature and vibration.

The present invention is achieved by the following technical solutions, the present invention includes: ultrasonic emitting receiver module and control module, wherein, the ultrasonic emitting receiver module links to each other with control module and transmits the range finding control signal by control module to the ultrasonic emitting receiver module, transmits the ultrasound data signal by the ultrasonic emitting receiver module to control module.

Described ultrasonic emitting receiver module comprises: square wave emission submodule, submodule is amplified in emission, the ultrasonic emitting submodule, ultrasound wave receives submodule, receive and amplify submodule, the detection submodule, ultrasonic testing receives submodule, check receives amplifies submodule and check detection submodule, wherein: square wave emission submodule links to each other with emission amplification submodule and transmits square-wave signal, emission is amplified submodule and is linked to each other with the ultrasonic emitting submodule and transmit square-wave signal through amplification, ultrasound wave reception submodule links to each other with reception amplification submodule and transmits the ultrasonic signal that receives, receive and amplify the ultrasonic signal that submodule links to each other with the detection submodule and transmits amplification, ultrasonic testing receives submodule and check and receives and amplify submodule and link to each other and transmit the ultrasonic signal that receives, and check receives amplifies submodule and check the detection submodule to link to each other and transmit the ultrasonic signal of amplification.

Described control module comprises: temperature detection submodule, single-chip microcomputer submodule and display sub-module, wherein: the temperature detection submodule links to each other with the single-chip microcomputer submodule and transmits temperature detection information, and the single-chip microcomputer submodule links to each other with display sub-module and the transmission range data-signal.

Ultrasonic ranging integrated system of the present invention, simple in structure, with low cost, be easy to realize, the multistage amplifier circuit system overcomes the drawback of receiving signal attenuation, increase system finding range, control module cooperates with the direct of ultrasonic emitting receiver module, reduced the measurement blind area, accuracy, stability and reliability have preferably been arranged.By temperature detection control, eliminate temperature for the influence of measuring; Receive by ultrasonic testing, reject the error information that causes because of vibration.

Embodiment

Below embodiments of the invention are elaborated, present embodiment is being to implement under the prerequisite with the technical solution of the present invention, provided detailed embodiment and concrete operating process, but protection scope of the present invention is not limited to following embodiment.

As shown in Figure 1, present embodiment comprises: ultrasonic emitting receiver module and control module, wherein: the ultrasonic emitting receiver module links to each other with control module and transmits the range finding control signal by control module to the ultrasonic emitting receiver module, transmits the ultrasound data signal by the ultrasonic emitting receiver module to control module.

Described ultrasonic emitting receiver module comprises: square wave emission submodule 1, submodule 2 is amplified in emission, ultrasonic emitting submodule 3, ultrasound wave receives submodule 4, receive and amplify submodule 5, detection submodule 6, ultrasonic testing receives submodule 7, check receives amplifies submodule 8 and check detection submodule 9, wherein: square wave emission submodule 1 links to each other with emission amplification submodule 2 and transmits square-wave signal, emission is amplified submodule 2 and is linked to each other with ultrasonic emitting submodule 3 and transmit square-wave signal through amplification, ultrasound wave reception submodule 4 links to each other with reception amplification submodule 5 and transmits the ultrasonic signal that receives, receive and amplify the ultrasonic signal that submodule 5 links to each other with detection submodule 6 and transmits amplification, ultrasonic testing receives submodule 7 and check and receives and amplify submodule 8 and link to each other and transmit the ultrasonic signal that receives, and check receives amplifies submodule 8 and check detection submodule 9 to link to each other and transmit the ultrasonic signal of amplification.

The multivibrator that described square wave emission submodule 1 adopts 74HC00 to constitute, the square-wave signal of generation 40kHz.The gating pulse control that this signal is sent by the single-chip microcomputer submodule of control module (be about to square-wave signal and control signal insert respectively with input end, output be pulse train); Emission is amplified submodule 2 and has been adopted two-stage cascode cascade amplifying circuit, and the first order is made up of 9018 total radio amplifier, and the second level has used enlargement factor and the bigger TIP122 (Darlington transistor) of withstand voltage to constitute; Ultrasonic emitting submodule 3 adopts ultrasonic transducer 40T, is connected in parallel on the CE two ends of cascade triode; Ultrasound wave receives submodule 4 and ultrasonic testing reception submodule 7 all adopts ultrasonic transducer 40R; Submodule 5 is amplified in reception and check reception amplification submodule 8 all adopts LM324 type amplifier, is that the signal that the 40R with ultrasonic transducer 40T pairing receives is amplified; Detection submodule 6 and check detection submodule 9 all adopt LM567 type wave detector, and the signal that receives was carried out detection, the filtering superfluous signal before the input single-chip microcomputer.

Described control module comprises: temperature detection submodule 10, single-chip microcomputer submodule 11 and display sub-module 12, wherein: temperature detection submodule 10 links to each other with single-chip microcomputer submodule 11 and transmits temperature detection information, and single-chip microcomputer submodule 11 links to each other with display sub-module 12 and the transmission range data-signal.

Described temperature detection submodule 10 adopts the temperature sensor DS18B20 that comprises analog-to-digital conversion module, single-chip microcomputer submodule 11 adopts the 89S52 type single-chip microcomputer of Atmel company, this model single-chip microcomputer and 51 series are compatible, has 32 programmable Is/O line, three 16 bit timing device/counters, 8 interrupt sources; Described display sub-module 12 adopts common 47 segment encode charactrons.

After described system sends distance measuring instruction by single-chip microcomputer 11, take place 1 by square wave, amplify 2, send ultrasound wave by transmitter 3, the ultrasound wave that sends returns after running into barrier, receive by the receiving trap that is installed in both sides respectively, by corresponding ultrasound wave receive 4, amplify 5, devices such as detection 6 and check receive 7, check amplifies 8, check detection 9, obtain two cover waveforms and send single-chip microcomputer 11 back to, if both errors are less than setting value, then calculate the mistiming by waveform difference, thus the distance of calculating.Simultaneously, by the measured temperature of temperature detection 10, institute's computed range is revised.

Because described system has considered temperature, vibration and has changed the error that causes, therefore be applicable to application such as various precision measurements, mal-condition measurement, at 30 ℃ and 15 ℃, respectively the experimental liquid liquid level is measured under level land and the vehicle-mounted condition: 15 centimetres-20 centimetres when dark, measuring error is less than 2%; 20 centimetres-150 centimetres when dark, measuring error is less than 4 ‰.

Claims

1. supersonic range finder, comprise: ultrasonic emitting receiver module and control module, wherein, the ultrasonic emitting receiver module links to each other with control module and transmits the range finding control signal by control module to the ultrasonic emitting receiver module,, it is characterized in that to control module transmission ultrasound data signal by the ultrasonic emitting receiver module:

2. supersonic range finder according to claim 1, it is characterized in that, described control module comprises: temperature detection submodule, single-chip microcomputer submodule and display sub-module, wherein: the temperature detection submodule links to each other with the single-chip microcomputer submodule and transmits temperature detection information, and the single-chip microcomputer submodule links to each other with display sub-module and the transmission range data-signal.

3. supersonic range finder according to claim 1 is characterized in that, in the described ultrasonic emitting receiver module: square wave emission submodule adopts multivibrator, produces the square-wave signal of 40kHz; Emission is amplified submodule and is adopted two-stage cascode cascade amplifying circuit, and the first order is that total radio amplifier is formed, and the second level is that Darlington transistor constitutes; The ultrasonic emitting submodule adopts ultrasonic transducer to be connected in parallel on the two ends of cascade triode; Ultrasound wave receives submodule and ultrasonic testing reception submodule all adopts ultrasonic transducer, and submodule is amplified in reception and check reception amplification submodule all adopts LM324 type amplifier, and detection submodule and check detection submodule all adopt LM567 type wave detector.

4. supersonic range finder according to claim 2, it is characterized in that, in the described control module: the temperature detection submodule adopts the temperature sensor that comprises analog-to-digital conversion module, built-in 32 programmable Is of single-chip microcomputer submodule/O line, three 16 bit timing device/counters and 8 interrupt sources, display sub-module adopts common 47 segment encode charactrons.